Update dependency @vitest/coverage-v8 to v3

Author: renovate[bot]

package.json

@@ -44,7 +44,7 @@
     "@types/nunjucks": "3.2.6",
     "@types/semver": "7.7.0",
     "@types/supertest": "6.0.3",
-    "@vitest/coverage-v8": "2.1.8",
+    "@vitest/coverage-v8": "3.1.2",
     "common-tags": "1.8.2",
     "esbuild": "0.25.2",
     "eslint": "9.25.0",